Sam Spade

Ricardo Cortez

Acting

Ruth Wonderly

Bebe Daniels

Acting

Casper Gutman

Dudley Digges

Acting

Effie Perrine

Una Merkel

Acting

Police Lt. Dundy

Robert Elliott

Acting

Iva Archer

Thelma Todd

Acting

Dr. Joel Cairo

Otto Matieson

Acting

Miles Archer

Walter Long

Acting

Wilmer Cook

Dwight Frye

Acting

Det. Sgt. Tom Polhaus

J. Farrell MacDonald

Acting

Capt. John Jacobi (uncredited)

Agostino Borgato

Acting

District Attorney (uncredited)

Morgan Wallace

Acting

Sarah the Prison Matron (uncredited)

Lucille Ward

Acting